我们展示了如何使用图形神经网络来解决规范的图形着色问题。我们将颜色框架为多类节点分类问题,并基于统计物理Potts模型利用无监督的培训策略。对其他多级问题(例如社区检测,数据聚类和最低集团封面问题)的概括是简单的。我们提供数值基准结果,并通过端到端的应用程序说明了我们的方法,用于在全面的编码程序框架内实现现实世界调度案例。我们的优化方法在PAR或优于现有求解器上执行,并能够扩展到数百万变量的问题。
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我们解决了与行业相关的尺度上的机器人轨迹计划问题。我们的端到端解决方案将高度通用的随机键算法与模型堆叠和集成技术集成在一起,以及用于溶液细化的路径重新链接。核心优化模块由偏置的随机基遗传算法组成。通过与问题依赖性和问题相关模块的独特分离,我们通过约束的天然编码实现了有效的问题表示。我们表明,对替代算法范式(例如模拟退火)的概括是直接的。我们为行业规模的数据集提供数值基准结果。发现我们的方法始终超过贪婪的基线结果。为了评估当今量子硬件的功能,我们使用Amazon Braket上的QBSOLV在量子退火硬件上获得的经典方法进行了补充。最后,我们展示了如何将后者集成到我们的较大管道中,从而为问题提供了量子准备的混合解决方案。
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组合优化是运营研究和计算机科学领域的一个公认领域。直到最近,它的方法一直集中在孤立地解决问题实例,而忽略了它们通常源于实践中的相关数据分布。但是,近年来,人们对使用机器学习,尤其是图形神经网络(GNN)的兴趣激增,作为组合任务的关键构件,直接作为求解器或通过增强确切的求解器。GNN的电感偏差有效地编码了组合和关系输入,因为它们对排列和对输入稀疏性的意识的不变性。本文介绍了对这个新兴领域的最新主要进步的概念回顾,旨在优化和机器学习研究人员。
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近年来,基于Weisfeiler-Leman算法的算法和神经架构,是一个众所周知的Graph同构问题的启发式问题,它成为具有图形和关系数据的机器学习的强大工具。在这里,我们全面概述了机器学习设置中的算法的使用,专注于监督的制度。我们讨论了理论背景,展示了如何将其用于监督的图形和节点表示学习,讨论最近的扩展,并概述算法的连接(置换 - )方面的神经结构。此外,我们概述了当前的应用和未来方向,以刺激进一步的研究。
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我们提出了一个通用图形神经网络体系结构,可以作为任何约束满意度问题(CSP)作为末端2端搜索启发式训练。我们的体系结构可以通过政策梯度下降进行无监督的培训,以纯粹的数据驱动方式为任何CSP生成问题的特定启发式方法。该方法基于CSP的新型图表,既是通用又紧凑的,并且使我们能够使用一个GNN处理所有可能的CSP实例,而不管有限的Arity,关系或域大小。与以前的基于RL的方法不同,我们在全局搜索动作空间上运行,并允许我们的GNN在随机搜索的每个步骤中修改任何数量的变量。这使我们的方法能够正确利用GNN的固有并行性。我们进行了彻底的经验评估,从随机数据(包括图形着色,Maxcut,3-SAT和Max-K-Sat)中学习启发式和重要的CSP。我们的方法表现优于先验的神经组合优化的方法。它可以在测试实例上与常规搜索启发式竞争,甚至可以改善几个数量级,结构上比训练中看到的数量级更为复杂。
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近似组合优化已成为量子计算机最有前途的应用领域之一,特别是近期的应用领域之一。在这项工作中,我们专注于求解最大切割问题的量子近似优化算法(QAOA)。具体而言,我们解决了QAOA中的两个问题,如何选择初始参数,以及如何随后培训参数以找到最佳解决方案。对于前者来说,我们将图形神经网络(GNN)作为QAOA参数的初始化例程,在热启动技术中添加到文献。我们不仅显示了GNN方法概括,而且不仅可以增加图形尺寸,还可以增加图形大小,这是其他热启动技术无法使用的功能。为了培训QAOA,我们测试了几个优化员以获得MaxCut问题。这些包括在文献中提出的量子感知/不可知论者,我们还包括机器学习技术,如加强和元学习。通过纳入这些初始化和优化工具包,我们展示了如何培训QAOA作为端到端可分散的管道。
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Pre-publication draft of a book to be published byMorgan & Claypool publishers. Unedited version released with permission. All relevant copyrights held by the author and publisher extend to this pre-publication draft.
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Steiner树问题(STP)在图中旨在在连接给定的顶点集的图表中找到一个最小权重的树。它是一种经典的NP - 硬组合优化问题,具有许多现实世界应用(例如,VLSI芯片设计,运输网络规划和无线传感器网络)。为STP开发了许多精确和近似算法,但它们分别遭受高计算复杂性和弱案例解决方案保证。还开发了启发式算法。但是,它们中的每一个都需要应用域知识来设计,并且仅适用于特定方案。最近报道的观察结果,同一NP-COLLECLIAL问题的情况可能保持相同或相似的组合结构,但主要在其数据中不同,我们调查将机器学习技术应用于STP的可行性和益处。为此,我们基于新型图形神经网络和深增强学习设计了一种新型模型瓦坎。 Vulcan的核心是一种新颖的紧凑型图形嵌入,将高瞻度图形结构数据(即路径改变信息)转换为低维矢量表示。鉴于STP实例,Vulcan使用此嵌入来对其路径相关的信息进行编码,并基于双层Q网络(DDQN)将编码的图形发送到深度加强学习组件,以找到解决方案。除了STP之外,Vulcan还可以通过将解决方案(例如,SAT,MVC和X3C)来减少到STP来找到解决方案。我们使用现实世界和合成数据集进行广泛的实验,展示了vulcan的原型,并展示了它的功效和效率。
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Deep learning has revolutionized many machine learning tasks in recent years, ranging from image classification and video processing to speech recognition and natural language understanding. The data in these tasks are typically represented in the Euclidean space. However, there is an increasing number of applications where data are generated from non-Euclidean domains and are represented as graphs with complex relationships and interdependency between objects. The complexity of graph data has imposed significant challenges on existing machine learning algorithms. Recently, many studies on extending deep learning approaches for graph data have emerged. In this survey, we provide a comprehensive overview of graph neural networks (GNNs) in data mining and machine learning fields. We propose a new taxonomy to divide the state-of-the-art graph neural networks into four categories, namely recurrent graph neural networks, convolutional graph neural networks, graph autoencoders, and spatial-temporal graph neural networks. We further discuss the applications of graph neural networks across various domains and summarize the open source codes, benchmark data sets, and model evaluation of graph neural networks. Finally, we propose potential research directions in this rapidly growing field.
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Recently, graph neural networks (GNNs) have revolutionized the field of graph representation learning through effectively learned node embeddings, and achieved state-of-the-art results in tasks such as node classification and link prediction. However, current GNN methods are inherently flat and do not learn hierarchical representations of graphs-a limitation that is especially problematic for the task of graph classification, where the goal is to predict the label associated with an entire graph. Here we propose DIFFPOOL, a differentiable graph pooling module that can generate hierarchical representations of graphs and can be combined with various graph neural network architectures in an end-to-end fashion. DIFFPOOL learns a differentiable soft cluster assignment for nodes at each layer of a deep GNN, mapping nodes to a set of clusters, which then form the coarsened input for the next GNN layer. Our experimental results show that combining existing GNN methods with DIFFPOOL yields an average improvement of 5-10% accuracy on graph classification benchmarks, compared to all existing pooling approaches, achieving a new state-of-the-art on four out of five benchmark data sets.
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Graph Neural Networks (GNNs) are deep learning models designed to process attributed graphs. GNNs can compute cluster assignments accounting both for the vertex features and for the graph topology. Existing GNNs for clustering are trained by optimizing an unsupervised minimum cut objective, which is approximated by a Spectral Clustering (SC) relaxation. SC offers a closed-form solution that, however, is not particularly useful for a GNN trained with gradient descent. Additionally, the SC relaxation is loose and yields overly smooth cluster assignments, which do not separate well the samples. We propose a GNN model that optimizes a tighter relaxation of the minimum cut based on graph total variation (GTV). Our model has two core components: i) a message-passing layer that minimizes the $\ell_1$ distance in the features of adjacent vertices, which is key to achieving sharp cluster transitions; ii) a loss function that minimizes the GTV in the cluster assignments while ensuring balanced partitions. By optimizing the proposed loss, our model can be self-trained to perform clustering. In addition, our clustering procedure can be used to implement graph pooling in deep GNN architectures for graph classification. Experiments show that our model outperforms other GNN-based approaches for clustering and graph pooling.
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近年来,基于Weisfeiler-Leman算法的算法和神经架构,是图形同构的着名启发式问题,它被成为具有图形和关系数据的(监督)机器学习的强大工具。在这里,我们全面概述了机器学习设置中的算法使用。我们讨论了理论背景,展示了如何将其用于监督的图形和节点分类,讨论最近的扩展,以及其与神经结构的连接。此外,我们概述了当前的应用和未来方向,以刺激研究。
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近年来,在平衡(超级)图分配算法的设计和评估中取得了重大进展。我们调查了过去十年的实用算法的趋势,用于平衡(超级)图形分区以及未来的研究方向。我们的工作是对先前有关该主题的调查的更新。特别是,该调查还通过涵盖了超图形分区和流算法来扩展先前的调查,并额外关注并行算法。
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Graph classification is an important area in both modern research and industry. Multiple applications, especially in chemistry and novel drug discovery, encourage rapid development of machine learning models in this area. To keep up with the pace of new research, proper experimental design, fair evaluation, and independent benchmarks are essential. Design of strong baselines is an indispensable element of such works. In this thesis, we explore multiple approaches to graph classification. We focus on Graph Neural Networks (GNNs), which emerged as a de facto standard deep learning technique for graph representation learning. Classical approaches, such as graph descriptors and molecular fingerprints, are also addressed. We design fair evaluation experimental protocol and choose proper datasets collection. This allows us to perform numerous experiments and rigorously analyze modern approaches. We arrive to many conclusions, which shed new light on performance and quality of novel algorithms. We investigate application of Jumping Knowledge GNN architecture to graph classification, which proves to be an efficient tool for improving base graph neural network architectures. Multiple improvements to baseline models are also proposed and experimentally verified, which constitutes an important contribution to the field of fair model comparison.
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In the last few years, graph neural networks (GNNs) have become the standard toolkit for analyzing and learning from data on graphs. This emerging field has witnessed an extensive growth of promising techniques that have been applied with success to computer science, mathematics, biology, physics and chemistry. But for any successful field to become mainstream and reliable, benchmarks must be developed to quantify progress. This led us in March 2020 to release a benchmark framework that i) comprises of a diverse collection of mathematical and real-world graphs, ii) enables fair model comparison with the same parameter budget to identify key architectures, iii) has an open-source, easy-to-use and reproducible code infrastructure, and iv) is flexible for researchers to experiment with new theoretical ideas. As of December 2022, the GitHub repository has reached 2,000 stars and 380 forks, which demonstrates the utility of the proposed open-source framework through the wide usage by the GNN community. In this paper, we present an updated version of our benchmark with a concise presentation of the aforementioned framework characteristics, an additional medium-sized molecular dataset AQSOL, similar to the popular ZINC, but with a real-world measured chemical target, and discuss how this framework can be leveraged to explore new GNN designs and insights. As a proof of value of our benchmark, we study the case of graph positional encoding (PE) in GNNs, which was introduced with this benchmark and has since spurred interest of exploring more powerful PE for Transformers and GNNs in a robust experimental setting.
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在过去十年中,图形内核引起了很多关注,并在结构化数据上发展成为一种快速发展的学习分支。在过去的20年中,该领域发生的相当大的研究活动导致开发数十个图形内核,每个图形内核都对焦于图形的特定结构性质。图形内核已成功地成功地在广泛的域中,从社交网络到生物信息学。本调查的目标是提供图形内核的文献的统一视图。特别是,我们概述了各种图形内核。此外,我们对公共数据集的几个内核进行了实验评估,并提供了比较研究。最后,我们讨论图形内核的关键应用,并概述了一些仍有待解决的挑战。
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Machine Unerning是在收到删除请求时从机器学习(ML)模型中删除某些培训数据的影响的过程。虽然直接而合法,但从划痕中重新训练ML模型会导致高计算开销。为了解决这个问题,在图像和文本数据的域中提出了许多近似算法,其中SISA是最新的解决方案。它将训练集随机分配到多个碎片中,并为每个碎片训练一个组成模型。但是,将SISA直接应用于图形数据可能会严重损害图形结构信息,从而导致的ML模型实用程序。在本文中,我们提出了Grapheraser,这是一种针对图形数据量身定制的新型机器学习框架。它的贡献包括两种新型的图形分区算法和一种基于学习的聚合方法。我们在五个现实世界图数据集上进行了广泛的实验,以说明Grapheraser的学习效率和模型实用程序。它可以实现2.06 $ \ times $(小数据集)至35.94 $ \ times $(大数据集)未学习时间的改进。另一方面,Grapheraser的实现最高62.5美元\%$更高的F1分数,我们提出的基于学习的聚合方法可达到高达$ 112 \%$ $ F1分数。 github.com/minchen00/graph-unlearning}。}。}
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图表表示学习是一种快速增长的领域,其中一个主要目标是在低维空间中产生有意义的图形表示。已经成功地应用了学习的嵌入式来执行各种预测任务,例如链路预测,节点分类,群集和可视化。图表社区的集体努力提供了数百种方法,但在所有评估指标下没有单一方法擅长,例如预测准确性,运行时间,可扩展性等。该调查旨在通过考虑算法来评估嵌入方法的所有主要类别的图表变体,参数选择,可伸缩性,硬件和软件平台,下游ML任务和多样化数据集。我们使用包含手动特征工程,矩阵分解,浅神经网络和深图卷积网络的分类法组织了图形嵌入技术。我们使用广泛使用的基准图表评估了节点分类,链路预测,群集和可视化任务的这些类别算法。我们在Pytorch几何和DGL库上设计了我们的实验,并在不同的多核CPU和GPU平台上运行实验。我们严格地审查了各种性能指标下嵌入方法的性能,并总结了结果。因此,本文可以作为比较指南,以帮助用户选择最适合其任务的方法。
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即使机器学习算法已经在数据科学中发挥了重要作用,但许多当前方法对输入数据提出了不现实的假设。由于不兼容的数据格式,或数据集中的异质,分层或完全缺少的数据片段,因此很难应用此类方法。作为解决方案,我们提出了一个用于样本表示,模型定义和培训的多功能,统一的框架,称为“ Hmill”。我们深入审查框架构建和扩展的机器学习的多个范围范式。从理论上讲,为HMILL的关键组件的设计合理,我们将通用近似定理的扩展显示到框架中实现的模型所实现的所有功能的集合。本文还包含有关我们实施中技术和绩效改进的详细讨论,该讨论将在MIT许可下发布供下载。该框架的主要资产是其灵活性,它可以通过相同的工具对不同的现实世界数据源进行建模。除了单独观察到每个对象的一组属性的标准设置外,我们解释了如何在框架中实现表示整个对象系统的图表中的消息推断。为了支持我们的主张,我们使用框架解决了网络安全域的三个不同问题。第一种用例涉及来自原始网络观察结果的IoT设备识别。在第二个问题中,我们研究了如何使用以有向图表示的操作系统的快照可以对恶意二进制文件进行分类。最后提供的示例是通过网络中实体之间建模域黑名单扩展的任务。在所有三个问题中,基于建议的框架的解决方案可实现与专业方法相当的性能。
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图形神经网络(GNNS)依赖于图形结构来定义聚合策略,其中每个节点通过与邻居的信息组合来更新其表示。已知GNN的限制是,随着层数的增加,信息被平滑,压扁并且节点嵌入式变得无法区分,对性能产生负面影响。因此,实用的GNN模型雇用了几层,只能在每个节点周围的有限邻域利用图形结构。不可避免地,实际的GNN不会根据图的全局结构捕获信息。虽然有几种研究GNNS的局限性和表达性,但是关于图形结构数据的实际应用的问题需要全局结构知识,仍然没有答案。在这项工作中,我们通过向几个GNN模型提供全球信息并观察其对下游性能的影响来认证解决这个问题。我们的研究结果表明,全球信息实际上可以为共同的图形相关任务提供显着的好处。我们进一步确定了一项新的正规化策略,导致所有考虑的任务的平均准确性提高超过5%。
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